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post #31 of 34
Quote:
Originally Posted by lazu View Post
Are you sure about that? That seems like a heckuva lot to put on a mobo header. Most mobos are 1amp, maybe a bit more, max (I thought, at least...I could be wrong.) If I'm not entirely off-base I think you could burn out the header. Those AP30s need 1.35A to start...I'd be careful about hooking them up to a mobo.
With the Rheosmart, the PWM header on the mobo is not used for power.
The Rheosmart only uses the PWM signal to adjust resistance to the fans. So you would plug a 4 pin Molex into the Rheosmart, and the PWM signal from the mobo.

The PWM signal tells the Rheosmart how much the power from the Molex to the fans is to be undervolted.

You can have the option to return the tach signal to the PWM header, so as to have full control of the fans from the mobo/speedfan/BIOS.

Or you could simply push a button on the Rheosmart to get manual control of the fans..... but when the mobo controls the fans perfectly, I don't know why anyone would want the manual option.

Have a look at Martin's review of the Rheosmart 3 on his MLL site.

My next rig will have two 120.4 rads. Each rad will be equipped with 8 GT 2150 in push/pull with home made shrouds on both sides. That is 16 fans at 1.5 watt each and I will control them all with the Rheosmart 6 via the CPU_FAN header.
That will be about 3 fans per channel, so I'll still be keeping it under 5 watts per channel.
But I am going to train a slow silent fan onto the Rheosmart's heatsinks just to be safe.
I might try to upgrade the heatsinks too but I don't think that will be necessary.

You can also have a look in my recent threads for more info, Martin contributed to both threads:

Fan Undervolting / Noise / RPM ??

The Reosmart PMW controllers??

Cheers,
PepeLapiu
Edited by PepeLapiu - 5/31/11 at 6:57pm
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post #32 of 34
Quote:
Originally Posted by lazu View Post
Those AP30s need 1.35A to start...I'd be careful about hooking them up to a mobo.
The fans won't be hooked up to the mobo. The mobo only tells the Rheosmart how fast it wants the fans. Then the Rheosmart adjusts the power to the fans, the power is supplied by the PSU.

With only two AP30's, you only need the Rheosmart 3 and have one fan per channel. And still have a channel to spare for whatever else.

Hell, mine won't even be on the front panel. I'll be hiding it inside the case because I see no use for manual control when the mobo already optimises fan speed as needed.

Cheers,
PepeLapiu
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post #33 of 34
Quote:
Originally Posted by PepeLapiu View Post
With the Rheosmart, the PWM header on the mobo is not used for power.
The Rheosmart only uses the PWM signal to adjust resistance to the fans. So you would plug a 4 pin Molex into the Rheosmart, and the PWM signal from the mobo.

The PWM signal tells the Rheosmart how much the power from the Molex to the fans is to be undervolted.

You can have the option to return the tach signal to the PWM header, so as to have full control of the fans from the mobo/speedfan/BIOS.

Or you could simply push a button on the Rheosmart to get manual control of the fans..... but when the mobo controls the fans perfectly, I don't know why anyone would want the manual option.

Have a look at Martin's review of the Rheosmart 3 on his MLL site.

My next rig will have two 120.4 rads. Each rad will be equipped with 8 GT 2150 in push/pull with home made shrouds on both sides. That is 16 fans at 1.5 watt each and I will control them all with the Rheosmart 6 via the CPU_fan header.
That will be about 3 fans per channel, so I'll still be keeping it under 5 watts per channel.
But I am going to train a slow silent fan onto the Rheosmart's heatsinks just to be safe.
I might try to upgrade the heatsinks too but I don't think that will be necessary.

You can also have a look in my recent threads for more info, Martin contributed to both threads:

Fan Undervolting / Noise / RPM ??

The Reosmart PMW controllers??

Cheers,
PepeLapiu
Ah, that's fantastic. I might pick one of those up also lol. Yeah, I was thinking that the component would power the fans from the motherboard, like a normal fan controller.

Thanks for the info. I've been looking to upgrade my fans on my rads, and was actually trying to plan out how I would run all of them (without the wires getting crazy.) I was thinking of some sort of terminal, as I noted above; but, this would work as well I believe.
    
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post #34 of 34
I did end up burning a couple of fan controllers on my last build. So be careful, they do get very hot.

What most people don't understand is that the more it slows down the fans, the hotter the controller gets: the controller gets 12 volt from the PSU and if you want it to slow the speed of your fans by 25% then the controller turns 25% of the voltage (3 volts) into heat.

So check that the back of your controller gets good ventilation inside that small 5.25" bay. If the heat sinks get too hot for your comfort, reduce the load or train a small fan onto the heat sinks.
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